package pab.ui.auxiliary;

public class Base64 {
	 private static final String base64code = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
         + "abcdefghijklmnopqrstuvwxyz" + "0123456789" + "+/";
	 private static final int splitLinesAt = 76;

	 public static byte[] zeroPad(int length, byte[] bytes) {
		    byte[] padded = new byte[length]; // initialized to zero by JVM
		    System.arraycopy(bytes, 0, padded, 0, bytes.length);
		    return padded;
		}
		public static String encode(String string) {
		    String encoded = "";
		    byte[] stringArray;
		    try {
		        stringArray = string.getBytes("UTF-8");  // use appropriate encoding string!
		    } catch (Exception ignored) {
		        stringArray = string.getBytes();  // use locale default rather than croak
		    }
		    int paddingCount = (3 - (stringArray.length % 3)) % 3;
		    stringArray = zeroPad(stringArray.length + paddingCount, stringArray);
		    for (int i = 0; i < stringArray.length; i += 3) {
		        int j = ((stringArray[i] & 0xff) << 16) +
		            ((stringArray[i + 1] & 0xff) << 8) + 
		            (stringArray[i + 2] & 0xff);
		        encoded = encoded + base64code.charAt((j >> 18) & 0x3f) +
		            base64code.charAt((j >> 12) & 0x3f) +
		            base64code.charAt((j >> 6) & 0x3f) +
		            base64code.charAt(j & 0x3f);
		    }
		    return splitLines(encoded.substring(0, encoded.length() - paddingCount) +
		    	    "==".substring(0, paddingCount));
		}
	public static String splitLines(String string) {
	    String lines = "";
	    for (int i = 0; i < string.length(); i += splitLinesAt) {
	        lines += string.substring(i, Math.min(string.length(), i + 
	            splitLinesAt));
	        lines += "\r\n";
	    }
	    return lines;
	}
}
